In "Unfriended," an anonymous Skype user seeks revenge on those who drove a friend to kill herself by posting a video to YouTube. It's scary because it's easy to imagine the scenario really playing out.

The top five reasons to unfriend someone on Facebook, the best Taco Bell food hack you've never heard about, a new tool that maps your DNA back 1,000 years, and a breakdown of Amazon and Twitter's new product, #AmazonCart.